Catherine Ringer (October 18, 1957 – September 14, 2026) was a French singer, songwriter, composer, multi-instrumentalist, dancer, choreographer, actress, former pornographic performer, and co-founder of the pop rock group Les Rita Mitsouko. She is the daughter of French artist Sam Ringer. She is also the lead vocalist for Plaza Francia Orchestra where she performs with Eduardo Makaroff and Christoph H. Müller, formerly of Gotan Project.

Ringer started her professional career on stage in the late 1970s in productions with Michael Lonsdale's Théâtre de Recherche Musicale as well as musical and dance productions. In 1976, she met the Argentine dancer and choreographer Marcia Moretto with whom she studied and also performed in various venues in Paris. The hit song "Marcia Baïla" was written as a tribute to Moretto after her death in 1981.